Anti-tamper detection device for notebook computer and notebook computer

Abstract

The embodiment of the utility model provides an anti-tamper detection device for notebook computer and notebook computer, notebook computer has host part, host part is equipped with back cover and processor, anti-tamper detection device includes the power supply part of providing voltage, switch element, first resistor and grounded second resistor, the power supply part is connected with the first end of the switch element, the processor is connected with the second end of the switch element and the second resistor, the second resistor is connected with the second end of the switch element, the resistance value of the first resistor is larger than that of the second resistor, and under the condition that the back cover is arranged on the host part, the switch element is closed and conducted. The first high-level signal is transmitted to the processor; when the back cover is separated from the host part, the switch element is turned off, and the first low-level signal is transmitted to the processor, so that the anti-tamper detection device can be used for tamper-proof detection of the notebook computer, and also can avoid probabilistic abnormal false triggering events.

Description

Technical Field

[0001] The utility model belongs to the technical field of electronic equipment, and in particular relates to an anti-disassembly detection device for a notebook computer and a notebook computer. Background Art

[0002] The new generation of Lenovo ThinkPad laptops now include a switch that detects hardware tampering. If the bottom cover is removed, the computer will not power on or display an error message. The tamper detection switch exists to prevent improper modification of the computer. If the tamper detection switch displays a startup error, the supervisor password must be entered to unlock the laptop. When the laptop was tested at the factory, it was found that in a high temperature, high humidity and high pressure environment, a false triggering occurred, that is, an error message was displayed when the bottom cover was confirmed to be open.

[0003] There are currently two detection schemes. The first is detection through screw holes. The method of screw hole detection is: when the back cover is closed, the two copper foils of the circuit board are short-circuited by locking the screws to achieve the effect. However, in some subsequent long-term use environments, it is easy for uncertain factors such as oxidation of the copper foil on the circuit board to indirectly affect the failure of the detection mechanism. After poor contact, the anti-tampering detection switch displays an error message when starting, that is, false triggering. The second is to use the elastic mechanism on the back cover to press the switch when the back cover is closed to trigger the switch to achieve the effect. However, since the switch is short-circuited when the back cover is removed and open-circuited when the back cover is closed, there is a chance of false triggering when foreign objects enter and cause a short circuit, or when there is water vapor in a high humidity environment during testing. Utility Model Content

[0004] In view of the above problems existing in the prior art, the purpose of the embodiments of the utility model is to provide an anti-tampering detection device for a laptop computer and a laptop computer, which can be used for anti-tampering detection of the laptop computer and can also avoid the occurrence of abnormal false triggering events with probability.

[0005] The first scheme adopted by the embodiment of the utility model is a disassembly detection device for a laptop computer, wherein the laptop computer has a host part, the host part is provided with a back cover and a processor, the disassembly detection device includes a power supply part for providing voltage, a switch element, a first resistor and a grounded second resistor, the power supply part is connected to the first end of the switch element, the first resistor is located between the power supply part and the first end of the switch element, the processor is respectively connected to the second end of the switch element and the second resistor, the second resistor is connected to the second end of the switch element, the resistance value of the first resistor is greater than the resistance value of the second resistor, when the back cover is provided on the host part, the switch element is closed and turned on, so that a first high-level signal is transmitted to the processor; when the back cover is separated from the host part, the switch element is turned off, and a first low-level signal is transmitted to the processor.

[0006] The second solution adopted by the embodiment of the utility model is a laptop computer, which includes a host part, the host part is provided with a back cover, a processor and an anti-disassembly detection device as described in any embodiment of the present application, and the anti-disassembly detection device is communicatively connected with the processor.

[0007] Compared with the prior art, the beneficial effect of the embodiment of the utility model is that: when the back cover is set on the host part, the power supply part is connected with the first resistor, the switch element, and the second resistor in sequence. Since the processor is connected with the second resistor and the switch element, the processor can receive the first high-level signal. At this time, the back cover is in a normal state and has not been disassembled. When the back cover is separated from the host part, the switch is disconnected, and the processor receives the first low-level signal. At this time, the processor can display the information of the startup error, and can also start the program of locking the laptop computer, etc., giving the user prompts in a timely and accurate manner to prevent the configuration of the laptop computer from being tampered with.

[0008] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not intended to restrict the present invention.

[0009] The overview of various implementations or examples of the technology described in this utility model is not a comprehensive disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In the drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar parts. The accompanying drawings generally illustrate various embodiments by way of example and not limitation, and together with the specification and claims, are used to illustrate the embodiments of the utility model. When appropriate, the same reference numerals are used in all drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present device or method.

[0011] Figure 1 The figure is a schematic diagram of the overall structure of the anti-tampering detection device for a notebook computer according to an embodiment of the utility model.

[0012] Reference numerals:

[0013] 1-power supply unit; 2-switching element; 3-first resistor; 4-second resistor; 5-processor; 6-first pin; 7-second pin; 8-third pin; 9-fourth pin; 10-reverse element; 11-third resistor; 12-capacitor element. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings of the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0015] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" and the like mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0016] In order to keep the following description of the embodiments of the present invention clear and concise, the present invention omits detailed descriptions of known functions and known components.

[0017] like Figure 1 As shown, an embodiment of the utility model provides an anti-disassembly detection device for a laptop computer, the laptop computer having a host part, the host part being provided with a back cover and a processor 5, the anti-disassembly detection device comprising a power supply part 1 for providing voltage, a switch element 2, a first resistor 3 and a grounded second resistor 4, the power supply part 1 being connected to a first end of the switch element 2, the first resistor 3 being located between the power supply part 1 and the first end of the switch element 2, the processor 5 being connected to a second end of the switch element 2 and a second resistor 4 respectively, the second resistor 4 being connected to a second end of the switch element 2, the resistance value of the first resistor 3 being greater than the resistance value of the second resistor 4, and when the back cover is provided on the host part, the switch element 2 is closed and turned on, so that a first high level signal is transmitted to the processor 5; when the back cover is separated from the host part, the switch element 2 is turned off, and a first low level signal is transmitted to the processor 5.

[0018] When the switch element 2 is in a closed and conducting state, the power supply unit 1 is connected to the first resistor 3 and the second resistor 4 to form a path, and since the resistance of the second resistor 4 is greater than that of the first resistor 3, the processor 5 is connected to the second resistor 4, so the first high-level signal can be transmitted to the processor 5. Since the switch element 2 remains in a short-circuit state when the back cover is normally connected to the host unit, there will be no false triggering event when a foreign object touches the laptop computer and causes a short circuit. It can also avoid false triggering events when there is a short circuit caused by condensation of water vapor in a high temperature and high humidity environment. In addition, since the switch element 2 remains in a short-circuit state when the back cover is normally connected to the host unit, the material and labor costs of dispensing can be saved, and the production time can be shortened and the production efficiency can be improved.

[0019] When the switch element 2 is turned off, the power supply 1 is disconnected from the second resistor 4, and the processor 5 receives a first low-level signal. In this way, the anti-tampering process is triggered only at a low level, thereby avoiding false triggering caused by a high-level signal under the interference of a noise signal and being immune to the influence of the noise signal.

[0020] The host part of the laptop computer includes hardware resources such as the motherboard and the sound card, and the back cover has the function of protecting the hardware of the host part from being tampered with. When the back cover is removed from the host part, the processor 5 of the anti-disassembly detection device will receive a first low-level signal, thereby playing a reminder role. When the back cover is normally connected to the host part, the processor 5 will receive a first high-level signal. In this way, the connection status of the back cover and the host part can be distinguished.

[0021] In some embodiments, the switch element 2 is a normally open switch, which maintains a short circuit state when the back cover is normally connected to the host part to avoid false triggering events caused by foreign matter and water vapor.

[0022] In some embodiments, the normally open switch includes a switch body, a first pin 6 connected to the first end of the switch body, a second pin 7, and a third pin 8 and a fourth pin 9 connected to the second end of the switch body, the power supply unit 1 is connected to the first pin 6, the third pin 8 and the fourth pin 9 are connected to each other and are respectively connected to the processor 5 and the second resistor 4 through a first line. When the normally open switch is turned on, a short circuit occurs, and the first pin 6, the second pin 7, the third pin 8 and the fourth pin 9 are in contact. In this way, even if there is a short circuit caused by foreign matter, water vapor, etc., the processor 5 will still receive the first high level signal, and will not display a startup error, nor will it trigger the process of locking the laptop computer, so it can well prevent false triggering events.

[0023] In some embodiments, the anti-disassembly detection device further includes a detection unit, the detection unit is connected to the second pin 7 of the first end of the switch element 2, and the detection unit is connected to the processor 5. When the current of the power supply unit 1 flows to the detection unit via the first end of the switch element 2, the second low-level signal is transmitted to the processor 5, and when the current of the power supply unit 1 does not flow from the first end of the switch element 2 to the detection unit, the second high-level signal is transmitted to the processor 5. When the current of the power supply unit 1 flows through the first pin 6 and the second pin 7 of the switch element 2, and the processing unit detects the second low-level signal, it means that the solder joints of the first pin 6 and the second pin 7 are well bonded. Therefore, the detection unit can better detect whether the first pin 6 and the second pin 7 of the switch element 2 are well bonded.

[0024] In some embodiments, the anti-tampering detection device includes an inverting element 10, which is respectively connected to the processor 5 and the second pin 7 of the switch element 2. The inverting element 10 is used to convert the high-level signal transmitted from the power supply unit 1 into a low-level signal, and then send it to the processor 5.

[0025] In some embodiments, the reverse element 10 is an insulated gate field effect transistor, including a gate, a drain and a source, the gate is connected to the second pin 7 of the switch element 2, the drain is connected to the processor 5, and the source is grounded. When the first pin 6 and the second pin 7 of the switch element 2 are well connected, the gate is connected to a high-level signal, but at this time the source and the drain are turned on, and a second low-level signal is output. Therefore, it can be used to detect the contact condition of the two pin solder joints when the switch element 2 is used.

[0026] In some embodiments, the anti-tampering detection device further includes a grounded third resistor 11, and the third resistor 11 is connected to the gate of the inverting element 10. The third resistor 11 can ensure a low potential of the gate.

[0027] In some embodiments, the resistance of the second resistor 4 is 10 times the resistance of the first resistor 3. By setting the second resistance and the first resistance, it can be ensured that the processor 5 receives the first high level signal when the switch element 2 is short-circuited.

[0028] In some embodiments, the anti-tampering detection device further includes a grounded capacitor element 12, and the capacitor element 12 is respectively connected to the processor 5 and the second resistor 4. The capacitor element 12 is used for anti-static testing of the anti-tampering detection device.

[0029] The embodiment of the utility model further provides a laptop computer, the laptop computer includes a host part, the host part is provided with a back cover, a processor 5 and an anti-disassembly detection device as described in any embodiment of the present application, and the anti-disassembly detection device is communicatively connected with the processor 5. The laptop computer provided with the anti-disassembly detection device can have anti-disassembly detection to prevent false triggering, so as to better protect the configuration information of the laptop computer.

[0030] The above description is intended to be illustrative rather than restrictive, and those skilled in the art may make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure. Moreover, the above examples (or one or more of them) may be used in combination with each other, and it is contemplated that these embodiments may be combined with each other in various combinations or permutations.

Claims

1. An anti-tampering detection device for a notebook computer, the notebook computer having a host part, the host part having a back cover and a processor, characterized in that: The anti-disassembly detection device includes a power supply unit for providing voltage, a switch element, a first resistor and a grounded second resistor, the power supply unit is connected to the first end of the switch element, the first resistor is located between the power supply unit and the first end of the switch element, the processor is connected to the second end of the switch element and the second resistor respectively, the second resistor is connected to the second end of the switch element, and the resistance value of the first resistor is greater than the resistance value of the second resistor. When the back cover is disposed on the host part, the switch element is closed and turned on, so that a first high-level signal is transmitted to the processor; when the back cover is separated from the host part, the switch element is turned off, and a first low-level signal is transmitted to the processor.

2. The anti-tampering detection device for a notebook computer according to claim 1, characterized in that: The switch element is a normally open switch.

3. The anti-tampering detection device for a notebook computer according to claim 2, characterized in that: The normally open switch includes a switch body, a first pin connected to the first end of the switch body, a second pin, and a third pin and a fourth pin connected to the second end of the switch body, the power supply unit is connected to the first pin, the third pin and the fourth pin are connected to each other and are respectively connected to the processor and the second resistor through a first line.

4. The anti-tampering detection device for a notebook computer according to claim 3, characterized in that: The anti-disassembly detection device further includes a detection unit, the detection unit is connected to the second pin of the first end of the switch element, and the detection unit is connected to the processor. When the current of the power supply unit flows to the detection unit via the first end of the switching element, a second low level signal is transmitted to the processor, and when the current of the power supply unit does not flow from the first end of the switching element to the detection unit, a second high level signal is transmitted to the processor.

5. The anti-tampering detection device for a notebook computer according to claim 4, characterized in that: The detection unit includes an inverting element connected to the processor and the second pin of the switch element, respectively.

6. The anti-tampering detection device for a notebook computer according to claim 5, characterized in that: The reverse element is an insulated gate field effect transistor, including a gate, a drain and a source, the gate is connected to the second pin of the switch element, the drain is connected to the processor, and the source is grounded.

7. The anti-tampering detection device for a notebook computer according to claim 6, characterized in that: The anti-tampering detection device further includes a grounded third resistor, and the third resistor is connected to the gate of the reverse element.

8. The anti-tampering detection device for a notebook computer according to claim 1, characterized in that: The resistance of the second resistor is 10 times the resistance of the first resistor.

9. The anti-tampering detection device for a notebook computer according to claim 1, characterized in that: The anti-tampering detection device further includes a grounded capacitor element, and the capacitor element is connected to the processor and the second resistor respectively.

10. A notebook computer, characterized in that: The device comprises a host part, wherein the host part is provided with a back cover, a processor and the anti-disassembly detection device according to any one of claims 1 to 9, wherein the anti-disassembly detection device is communicatively connected with the processor.

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